I have two questions about this coin:First, I think that on this coin Julia Domna.Secondly, this coin was not cleaned, has recently been found, so that the best way to clean and preserve, and not to damage the patina with him.The maximum diameter of this coin is 18 millimeters, and weighs 2.9 grams, Mint in SisciaThanks Shandorr

Coin'd soaked cream "Melkfett mit Ringelblumen-Extrakt" (Dr Foster GmbH). Very greasy cream, half an hour after I'd washed in pure alcohol, and so would sediment on the coin much softened. Then I would remove it with a razor. This procedure would be repeated several times. then the coin would wash the alkali to neutralize the acid from alcohol. I use ash as a source of alkali. And finally smeared Turpentine oil.

The other ingredient is calendula, which I doubt is significant. Wikipedia says melkfett is 'bag balm' which is 8-hydroxyquinoline sulfate 0.3% in a petroleum jelly and lanolin base. In other words, soak coins in mild acid with grease! And acid comes from the balm rather than from alcohol.

Yes you are absolutely right. The cream must be as oily (Vaseline is best) This cream is something like vaseline with marigold extract, but does not have to be just that. Alcohol has a mild acidity, and effectively remove fat with coins. But the sediment on a coin after the treatment is much easier to remove mechanically. The procedure is necessary to repeat several times. I mention the need to end the coin wash solution. I protect you it Turpentine oil.Here's another example, but I ended up with a clean, Emperor Licinius